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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Accumulated other comprehensive income, net of tax          
Foreign currency translation adjustments $ 16,303   $ 16,303   $ 14,588
Actuarial gains related to defined benefit pension plans 2,886   2,886   1,909
Net unrealized (loss) gain on investments 71   71   (168)
Total accumulated other comprehensive income 19,260   19,260   16,329
Components of comprehensive income (loss)          
Net income (loss) 90,870 (36,443) 165,423 (19,828)  
Other comprehensive income (loss):          
Foreign currency translation adjustments 1,595 (19,311) 1,715 (36,746)  
Release of currency translation adjustment   (97,367)   (97,367)  
Actuarial gains (losses) related to defined benefit pension plans 433 (423) 977 (1,296)  
Unrealized gains (losses) on investments 73 (2,116) 239 (2,053)  
Other comprehensive income (loss) 2,101 (119,217) 2,931 (137,462)  
Total comprehensive income (loss) $ 92,971 $ (155,660) $ 168,354 $ (157,290)